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PRINCIPAL ACCOUNTING POLICIES - Exercisable options price range (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 $ / shares | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 $ / shares
Other disclosures |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 350 |  |  |  |
Weighted average recognized period | 2 years 4 months 24 days | 2 years 4 months 24 days |  |  |  |
Proceeds from exercise of share options | ¥ 179 | $ 26 | ¥ 307 |  | ¥ 159 |
After Share Subdivision |  |  |  |  |  |
Other disclosures |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  | $ 10.14 |  | $ 19.94 |  | $ 15.67

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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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